turn on Cycles GPU render on non CUDA computers
One way you could do it is to run this in a command line (or put it in a batch file). It enables Blender OpenCL test.

set CYCLES_OPENCL_TEST=all
"C:\Program Files\Blender Foundation\Blender\blender.exe"


Then, in Blender's settings, head over to the "System" tab, and enable OpenCL.



Reference: http://www.blenderartists.org/forum/showthread.php?302079-Blender-Cycles-AMD-Opencl-It-s-possible-working-now